Building-block.



No. 677,35l. Patented luly 2, |901. B. HAFFNER.

BUILDING BLOCK.

(Appicmgn filed Feb. 19, 1901.)

we' mams Prins co.. Maremma., wnsnmcwn n c UNITED STATES BALTHASAR HAFFNER, OF MAURER, NEW JERSEY.

SFEGEFEGTEON formingpart of Letters Patent No. 677,351, dated July 2, 1901.

Application filed February 19, 1901. Serial No. 47,898. (No model.)

To @ZZ whom it may concern:

Be it known that I, BALTHASAR HAFFNER, a citizen of the United States, and a resident of Maurer, Bergen county, New Jersey, have invented certain new and useful Improvements in Building-Blocks, of which the following is a specification.

This invention relates to an improved fireproof building-block for ceilings and iloors which is light and of superior strength.

In the accompanying drawings, Figure l is a perspective view of portion oi' a ceiling and iioor containing my improved block. Fig. 2 is a side elevation orn a pair of adjoining blocks, and Fig. 3 an end view of the same.

The blocks A, constructed of reproof material, are made hollow and of oblong shape. At the center one of the long sides of the lock is set back, as at a, to form a groove a', and the other long side is projected outward to form a corresponding tongue a. The upper and lower edges of the groove, as well as of the tongue, are beveled, so that the tongue of any one block will interlock with the groove of the adjoining block, Fig. 3. From the upper and lower ends of the setback section ai and of the base of tongue a, diagonal braces a3 extend toward the top and bottom of the block. These braces will not only increase the load carrying strength of the block, but they will reinforce the weak points formed at the junction of the receding section a4b with the side of the block. To take up lateral strain, a horizontal brace a2 extends transversely across the block between tongue and groove.

lnto one end of the block 'A there is cut a notch or notches at, adapted to receive the flange or flanges B of beam B. This notch a4 lies in a plane parallel to the groove d', but extends in a direction at right angles thereto. The tongues a and grooves a are respectively of such a width that the former may be introduced into the mouth of the latter, Fig. 3, the intimate union being formed by means of mortar or cement. ln use row after row of blocks A are built up between the beams B in the manner indicated in Fig. l, the adjoining rows being interlocked by means of the tongues and grooves and being arranged to break joints. In this way a ceiling and door is formed which is of superior strength and in which all the parts are connected in a very iirm and reliable manner.

What I claim is- A hollow iireproof building-block having a receding section to form a groove, an opposite outwardlyprojecting section to form a tongue, and diagonal braces extending from the ends of the receding. section and tongue respectively' to the top and bottom of the block, substantially as specied.

Signed by me at New York city, county and State of New York, this 18th day of February, 1901.

BALTHASAR HAFFNER.

itnesses WILLIAM SCHULZ,. F. v. BRIESEN. 

